The image formed by a concave mirror with the object placed at the center of curvature is real inverted and formed at the center of curvature. Using the ray diagram a ray from the top of the object to the mirror through f then reflected parallel to the principal axis,then the ray through the center of curvature reflected through the same point both intersect at a plane through center curvature and perpendicular to the principal axis. The point of intersection forms the top of the image and the center of curvature forms the bottom. Therefore, the correct choices are : real and inverted
The best estimate of the orbital period of a typical asteroid is 9.0 earth years.
Answer:
a) 1.95 m/s
b) 5.56 m
Explanation:
Given that:
Velocity of the skier 
= 14.3 m/s
For the skier moving in the direction of the wave, we have:
Period (T) = 0.450 s
Relative velocity (V) of the skier in regard with the wave = 
where:
= velocity of the skier
= velocity of the wave
The wavelength 
can be written as:
---------------> Equation (1)
For the skier moving opposite in the direction of the wave, we have:
Period (T) = 0.342 s
Relative velocity (V) of the skier in regard with the wave = 
The wavelength can be written as:
------------------> Equation 2
Equating equation (1) and equation (2) and substituting = 14.3 m/s ; we have:
Collecting the like terms; we have:
b)
The Wavelength of the wave can be calculated using : 
λ ≅ 5.56 m
Steel materials produce less vibrations whilst less dense and more malleable parts produce more vibrations, e.g. the wooden part of the coaster itself.
